Answer:
[-2; 1 ] is the new column vector
Step-by-step explanation:
See explanation in the attachment.
A) by completing the square... X^2-8x+16+20-16 = (x^2-4)^2 +20-16=(x^2-4)+4
B) Since the coefficient of x^2 is positive, it is a quadratic function which increases positively. You know that it will always be above the x axis and therefore positive since the vertex is at (4,4) and increasing
Both should be yes..there is exactly one x input for every y input